Carrier 50MP62L-10R, MPE62L-10R Compressor Replacement Ð Perform the following, Troubleshooting

Page 55

Hot Gas Bypass Ð An optional hot gas bypass system may be factory installed on circuit no. 1. This system will introduce discharge vapor from the compressor discharge line into the distributors and evaporator coil circuits on circuit no. 1 when suction pressures drop to damaging levels. No ®eld adjustments of the hot gas bypass valve should be required.

Condenser Fans Ð Each fan is supported by a formed wire mount bolted to fan deck and covered with a wire guard. The exposed end of the fan motor shaft is protected from weather by grease. If fan motor must be removed for service or replacement, be sure to regrease fan shaft and reinstall fan guard. For proper performance, fan should be 7¤8 in. (22 mm) below top of venturi on the fan deck to top of the fan hub. (See Fig. 64.) Tighten set screws to 15 ± 1 ft-lbs (20 ± 1.3 N-m). Figure 64 shows proper position of mounted fan.

NOTE: Fan rotation is clockwise when viewed from top of unit.

Fig. 64 Ð Condenser Fan Adjustment

IMPORTANT: Check for proper fan rotation (clock- wise viewed from above). If necessary to reverse, switch leads.

Compressor Removal Ð Access to the pump end of the compressor is from the compressor side of the unit. Access to the motor end of the compressor is from the inside of the unit. All compressors can be removed from the com- pressor side of the unit.

IMPORTANT: All compressor mounting hardware and support brackets removed during servicing must be re- installed prior to start-up.

1.Disconnect power to unit; lockout power to compressor.

2.Close suction and discharge service valves.

3.Relieve refrigerant pressure into a refrigerant recovery system.

4.Remove:

a.Fan-cycling pressure switch (FCPS)

b.High-pressure switch

c.Low-pressure switch

5.Disconnect power wires at terminal box and disconnect conduit.

6.Disconnect wires from crankcase heater.

7.Disconnect service valves from compressor.

NOTE: On units with 2 compressors per circuit, discon- nect both oil equalizer lines located on the motor barrel and on the oil pump sump.

8.Units 48/50MP62L:

a.Remove 4 large screws securing compressor mount- ing pan to unit base rail.

b.Slide compressor (on mounting pan) to outside of unit frame; support and/or lower to ground.

c.Unbolt compressor from mounting pan and remove.

9.Units 48/50MP70M,82N,90P,10R:

a.Remove 4 large screws securing compressor to the com- pressor rails.

b.Lift compressor off mounting bolts and remove.

Compressor Replacement Ð Perform the following:

1.Reverse procedure in Compressor Removal section to end of Step 4.

2.Reinstall service valves and safety switches, and tighten to torques as listed:

TORQUE

COMPRESSOR(S)

Tighten discharge valves to Ð

 

20-25 ft-lbs ( 27- 34 N-m)

06E-250

80-90 ft-lbs (109-122 N-m)

06E-265,275,299

Tighten suction valves to Ð

 

80- 90 ft-lbs (109-122 N-m)

06E-250

90-120 ft-lbs (122-163 N-m)

06E-265,275,299

Tighten the following ®ttings as speci®ed Ð

120 in.-lbs (13.5 N-m)

High-Pressure Switch

120 in.-lbs (13.5 N-m)

Low-Pressure Switch

3.Leak-check and evacuate system, reclaim refrigerant.

4.Recharge system per pre-start-up and start-up sequences. Recheck oil levels.

5.Energize crankcase heater for 24 hours prior to restart of system.

TROUBLESHOOTING

The 48/50MP units provide extensive troubleshooting in- formation to service personnel through the use of status codes and alarm and alert codes from the control system, which are displayed on the unit HSIO or through the use of Service Tool or CCN Building Supervisor. For more information on diagnostics, codes, and possible causes, refer to the Controls and Troubleshooting manual.

Use the Quick Test function to check control inputs and outputs (including economizer actuators). Refer to Controls and Troubleshooting Guide.

If there are indications of hunting (rapid oscillations) of control functions (such as duct static pressure or supply air temperature), or if the response rate is too slow, check the gain values. Refer to the Control Loop Checkout section on page 40 for more information.

If the unit is equipped with an optional VFD and the sup- ply or exhaust fan is not running when required, refer to the troubleshooting section of the separate VFD technical manual provided with the unit.

For troubleshooting information on mechanical systems, refer to the troubleshooting and diagnostics table on the next page.

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Contents Contents Installation, Start-Up and Service InstructionsSafety Considerations ContentsGeneral Install Outdoor Hoods InstallationBase Unit 48/50MP Physical DataPhysical Data FAN Motor Optional Power Exhaust SpecicationsCompressor Oil Charge Variable Frequency Drive VFD Physical DataRoof Curb Dimensions, 48/50MP62L and 70M Roof Curb Dimensions, 48/50MP82N-10R Base Unit Dimensions, 48MP62L, 70M Base Unit Dimensions, 48MP82N-10R Base Unit Dimensions, 50MP62L and 70M Base Unit Dimensions, 50MP82N-10R Size Unit WeightUnit Make Electrical Connections Field Electrical ConnectionsGND EquipNEC MCA Electrical DataFLA LRAManufacturer Recommended Sensor Device Non-Shielded CableSpace Temperature Sensor Wiring Space Temperature Sensor Averaging Heat Interlock Relay Outdoor Air¯ow Control Transducer/Thermistor CCN Connection Approved Shielded Cables COM CCNComm Auxiliary Control Box Location 50MP70M Unit Shown Gas Piping Details Installing Flue/Inlet Hoods 48MP Units OnlyFlue De¯ector Baffle Assembled Check Compressor MountingSystem Check PRE-START-UPExample Evaporator-Fan Belts, Pulleys, and Sheaves ÐFan Performance Forward Curved Ð 48/50MP70M Fan Performance Forward Curved Ð 48/50MP62LFan Performance Forward Curved Ð 48/50MP90P Fan Performance Forward Curved Ð 48/50MP82NFan Performance Air Foil Ð 48/50MP62L Fan Performance Forward Curved Ð 48/50MP10RFan Performance Air Foil Ð 48/50MP82N Fan Performance Air Foil Ð 48/50MP70MFan Performance Air Foil Ð 48/50MP10R Fan Performance Air Foil Ð 48/50MP90PControls Conguration and Quick Test Hsio Keypad Key Usage Keypad and Display Module Hsio ConfigurationSet Point Ranges and Defaults Basic Conguration Data SET Point Subfunction Display Default RangeSTART-UP Initial CheckSupply FAN GeneralOccupied Cooling Overrides IGC Control Board LED Alarms48/50MP Units SMG, SCV and MLG Recommended Starting Values Control Loop CheckoutLead Circuit Control SystemComponents Index of Lead/Lag Circuits CompressorsStby YES Keypad and Display Module HsioSUB Functions Hsio Keypad and Display Module Functions and SubfunctionsFunction Variable Frequency Drive VFD Display ServiceEVAPORATOR-FAN MOTORS, PULLEYS, and Belts Power Exhaust MOTORS, PULLEYS, and BeltsRefrigerant Circuit LubricationManufacturer Lubricant Charging Chart Ð Unit 48/50MP62L Charging Chart Unit 48/50MP90P Switch Cutout CUT-IN AdjustmentsPressure Switch Settings Psig kPag Belt Installation and Tensioning06E Compressors, Typical Compressor Protection Gas Valve AdjustmentProtective Devices Main Burner RemovalVariable Frequency Drive VFD High-Voltage Relay Modules DSIO1 and DSIO2 Processor Modules PsioStby no Troubleshooting Compressor Replacement Ð Perform the followingTorque Compressors Compressor Cycles on LOW-PRESSURE Switch Troubleshooting and DiagnosticsProblem Solution Compressor does not RUN Compressor Stops on HIGH-PRESSURE SwitchTroubleshooting and Diagnostics IGC Control Heating Ð 48MP Units Only Page Call for Free Catalog Packaged Service TrainingModel no Serial no Date Technician START-UP ChecklistIV. START-UP III. Preliminary Checklist ItemsCL-3 Fact Config Fanm

MPE62L-10R, 50MP62L-10R, 48MPD specifications

The Carrier 48MPD, 50MP62L-10R, and MPE62L-10R are advanced rooftop packaged units designed for a variety of commercial HVAC applications. These systems offer a compelling blend of energy efficiency, versatility, and high performance, making them ideal choices for businesses looking to enhance their indoor climate control.

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